Automatic retoucher for photographic negatives



(No Model.)

. E. A. GILBERT.

AUTOMATIC R'ETOUGHERFOR PHOTOGRAPHIC NBGATIVES. No. 264,146. PatentedSept. 12, 1882.

- INVENTOR. WITNESSES: t

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UNITED STATES PATENT OFFICE.

EMERSON A. GILBERT, OF MEADVILLE, PENNSYLVANIA.

AUTOMATIC RETOUCHER FOR PHOTOGRAPHIC NEGATIVES.

SPECIFICATION forming part of Letters Patent No. 264,146, datedSeptember 12, 1882.

Application filed February 16, 1882. (No model.)

To all whom it may concern:

Be it known that I, EMERSON A. GILBERT, a citizen of the United States,and a resident of Meadville, Crawford county, Pennsylvania,

have invented a new and useful Improvement in AutomaticltetouchersforPhotographic Negatives; and I do hereby declare the following to be afull and correct description of the same, reference being had to theaccompanying drawings, in which- Figure l is front view of my machine.Fig. 2 is a longitudinal section of the same on the line as to of Fig.1.

My invention consists ofcertain devices and combinations operated byclock-work for moving the pencil guided by the hand in retouchingphotographic negatives, all of which will be fully understood by thefollowing description and claims.

The object of this inventionis to produce rapid and uniform strokes of apencil forming part of the machine, and being guided by the hand for thepurpose of retouching photographic negative or crayon pictures.

In this machine thepencil is moved byclockwork, as follows A suitablecoiled spring, A, is the motive power. This spring gives motion to themain gear-wheel B, which engages with pinion 0, thus transmitting motionto the second gear-wheel, ]),which in turn gearsinto pinion ID,transmitting motion to the third wheel, F, and this, engaging withpinion G, re-

volves the ratchetwheel H, the teeth of which shake the pivoied bar orshaker I, as represented in Fig. 1.

To the shakcr'bar I is attached the rod K, which extends through thepencil-holder L and moves the point M, which holds the lead.

For regulating the speed of thepencilor the number of strokes per minutea worm, N, is used in connection with wortn-wheel O, the shaft of whichcarries pinion I receiving motion from gear-wheel Q on the same shaftwith ratchet-wheel II. This worm carries a balance-wheel, I and also afan-regulator, S, the wheel having radial slots for the insertion of thefans; also, the worm is provided with a brake consisting of aspring-wire, T, having a shoe, T, ofindia-rubber, and a tension-slide,T, for working the brake.

The shaker I is provided with a spiral tension-spring, U, and a rubberspring, V, acting in opposite directions in order to regulate the forceof the stroke of the stippling-point. The rubber spring gives an elasticinstead of a dead stroke to the point. The adjusting thumb-screw W has arubber jam-nut, X, placed between its outer ektremity and the case,which, being in a state of compression, operates to preventthe screwfrom being moved by the jar of the machine when in operation.

The suspender or cord Y has a link, Y, in which the pencil-holder freelyrevolves, and also a pivoted link: Y, and by means of these two linksthe suspender, while supporting the machine, does not interfere with thefree turning of the machine in the hand of the operator. The link Y isprevented from end-play by means of two pieces of rubber tubing, Z,which act as clamping or friction bands to hold the metallic washers w.A piece of rubber tubing, 2?, serves as a sliding clamp to fix the cordat any desired length. The snspender is provided with a pulley,p, havinga swivelcd hook in the usual manner.

The shaker -bar may be placed above the wheel, or at the side thereof,anda bevel-gear may he used in place of the worm and wormwheel; and forcrayon-pictures the stroke of the pencil should be slower,which may beily accomplished by a ratchet having a less number of teeth.

Other modifications may be made without deviating from my invention.

Having thus described my invention, what I Claim iS l. The pencil-holderK L M, SiltikGF-bill I, ratchet-wheels II I worm-wheel 0,worm,balancewheel, and fan N It S, brake T, wire '1, and tension-slide T incombination with opposition -springs U V, adjustingscrew IV, spring X,and operating clock-work, as shown and described.

2. The supporting devices consisting of link Y and the link 1,adjustable rubber clamps Z Z, sliding clamp t, cord Y, and pulley p, asshown and described.

3. In combination with the clock mechanism and ratchet-wheels H I theadjustingsprings U Vand rubberjam-nnt X, the shaker-bar S, brake T, wireT, tension slide T worm N, and wheel 0, as shownand described.

The above specification ot'iny said invention signed and witnessedatVashington this 16th day of February, A. D. 1882.

EMERSON A. GILBERT.

Witnesses:

DANIEL BREED, FRED G. DIE'rERIoII.

ICC

